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Orban 5750 Technical Manual
MODE
BYPASS GAIN
TONE FREQ
TONE LVL
TONE CHAN
PILOT
Facilities are self-explanatory, except for the following:
The T
L
control is calibrated under the assumption that the stereo pilot tone contributes 9% to the total
ONE
VL
modulation. Hence, a T
ONE
Note that when the OPTIMOD is in T
E
), these outputs apply 50μs or 75μs deemphasis to the output of the tone oscillator. Applying deemphasis this
MPH
way is only correct if equipment downstream from the OPTIMOD, like a transmitter's stereo encoder, applies
preemphasis before final transmission.
In B
mode, preemphasis is still applied to the signal path. The B
YPASS
internal headroom to make swept frequency response measurements without internal clipping. When the B
G
control is set to 0.0 dB and the AI R
AIN
dB from the analog input to the analog output at 100 Hz. If the AO P
configured for 75µs preemphasis, the gain from analog input to analog output will be approximately 0 dB at 15 kHz.
While this calibration may seem unintuitive, experience has shown that it greatly reduces calls to Orban customer
service complaining that the frequency response of the transmission path is not flat when in fact the measurement
in question was causing undetected clipping at high frequencies due to preemphasis.
---
O
PERATE
B
0.0
D
H
400
Z
%
91
---
L+R
---
ON
Table 3-7: Digital MPX
L
setting of 91% produces 100% modulation (91% + 9%).
VL
mode and its analog or digital L/R outputs are set to F
ONE
VU control is set to 0.0 dBu, you will observe a gain of approximately –17
EF
O
, B
PERATE
YPASS
−18 ... +25
16, 20, 25, 31.5, 40, 50,
63, 80, 100, 125, 160,
200, 250, 315, 400, 500,
630, 800, 1000, 1250, 1600, 2000,
2500, 3150, 4000, 5000,
6300, 8000, 9500, 10000, 12500,
13586.76, 15000
0 ... 121
L+R, L−R, LEFT; RIGHT
ON, OFF
G
control calibration allows enough
YPASS
AIN
-
control is set to P
RE
E
3-39
Operation
, T
---
ONE
1
LOG
1
---
---
(instead of P
LAT
-
and the 5750 is
RE
E
-
RE
YPASS
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